C# ReadProcessMemory: How to read a 64 bit memory address?

Solution 1:

You can path lpBaseAddress as Int64. Try replace your

[DllImport("kernel32.dll")]
    public static extern bool ReadProcessMemory(int hProcess,
    int lpBaseAddress, byte[] lpBuffer, int dwSize, ref int lpNumberOfBytesRead);

to

[DllImport("kernel32.dll")] 
public static extern bool ReadProcessMemory(int hProcess,
    Int64 lpBaseAddress, byte[] lpBuffer, int dwSize, ref int lpNumberOfBytesRead); 

But most correct implementation:

[DllImport("kernel32.dll")]
static extern bool ReadProcessMemory(IntPtr hProcess,
    IntPtr lpBaseAddress, [Out] byte[] lpBuffer, int dwSize, out IntPtr lpNumberOfBytesRead);